Dear Aspirant, 

AIIMS, New Delhi has decided to give Final opportunity for applicants who have completed their Basic Registration, Generation of Code and Final Registration but could not fill their exam city even after submitting the payment in Final Registration. 

You can login and fill your city choice till 9 April 2019 (up to 5 pm). 

Thanks!

i think this may be website error or your device error. for confirmation you can clear your broswer history and capcha. Try that page.

if your are still not able to proceed on the page than you can contact on aiims examination

https://www.aiimsexams.org/info/ContactUs.html